Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C ca

1.	Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:
A.	$1\frac{{13}}{{17}}$$ hours
B.	$2\frac{8}{{11}}$$ hours
C.	$3\frac{9}{{17}}$$ hours
D.	$4\frac{1}{2}$$ hours
Answer» D. $4\frac{1}{2}$$ hours

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Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

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